How long can the average person hold his breath underwater?

According to the Harvard University Gazette, the average person can hold his breath underwater for approximately one minute. However, Time Magazine explains that a person in good health should be a...
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How do penguins hold their breath underwater?

The 17 different species of penguins can be found anywhere from Antarctica to the equator. They hunt for their prey underwater using a highly developed respiratory system to cope with extreme depth...
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